Filter stdout for 051-thread when running on a Linux VM.

When testing on VM (regardless of the target architecture), the
underlying system is Linux not Android, and max thread priority differs
from the expected one. Filter out the offending lines from test output,
as otherwise the test passes.

Bug: 271573990
Test: run ART test 051-thread on a Linux RISC-V VM:

  lunch aosp_riscv64-userdebug

  export ART_TEST_SSH_USER=ubuntu
  export ART_TEST_SSH_HOST=localhost
  export ART_TEST_SSH_PORT=10001
  export ART_TEST_ON_VM=true

  . art/tools/buildbot-utils.sh
  art/tools/buildbot-build.sh --target

  # Create, boot and configure the VM.
  art/tools/buildbot-vm.sh create
  art/tools/buildbot-vm.sh boot
  art/tools/buildbot-vm.sh setup-ssh  # password: 'ubuntu'

  art/tools/buildbot-cleanup-device.sh
  art/tools/buildbot-setup-device.sh
  art/tools/buildbot-sync.sh

  art/test.py --target -r --no-prebuild --ndebug --64 --interpreter \
    051-thread

Change-Id: Ica690c3e7d787271ee82cc3ca19a969bb2da4250
1 file changed